"But it is in fact a perfectly authentic expression of the 21-year-old college senior who was voted “preppiest in the class” at Choate Rosemary Hall and has a sincere love for Stubbs & Wootton slipper shoes and melon-colored pants. “I can’t live in a minimalist world,” says Sinsteden, who is majoring in French and art history. “For me, it’s all about eclecticism.”N.Y.T.He had decorated his